00393nas a2200145   4500000000100000000000100001008004100002100001100043700001200054700001200066245013700078300001100215490000700226022001400233       2013                            d1 aE. Hak1 aK. Shea1 aS. Jick00aAssociation of infant pneumococcal vaccination with pneumococcal pneumonia among mothers: a nested case-control study using the GPRD  a1590-60 v31  a0264-410x